from django.db import models

# Create your models here.
from django.utils import timezone 
from django.contrib.auth.models import User 
from django.urls import reverse
# 其他导⼊代码⽆修改，此处已经省略
from taggit.managers import TaggableManager
class PublishedManager(models.Manager):
  def get_queryset(self):
    return super(PublishedManager,
self).get_queryset().filter(status='published')
class Post(models.Model): 
  objects = models.Manager()
  published = PublishedManager()
  # 增加tags标签字段
  tags = TaggableManager()
  STATUS_CHOICES = ( 
    ('draft', 'Draft'), 
    ('published', 'Published') 
  ) 
  title = models.CharField(max_length=250) 
  body = models.TextField() 
  slug = models.SlugField(max_length=250, unique_for_date='publish') #字段:唯一标识码
  author = models.ForeignKey(User, on_delete=models.CASCADE, 
related_name='author') 
  publish = models.DateTimeField(default=timezone.now) 
  created = models.DateTimeField(auto_now_add=True) 
  updated = models.DateTimeField(auto_now=True) 
  status = models.CharField(max_length=10, choices=STATUS_CHOICES, 
default='draft') 
  class Meta: 
      ordering = ('-publish',) 
  def __str__(self): 
    return self.title 
  def get_absolute_url(self): 
    return reverse('blog:post_detail', args=[self.publish.year,
                  self.publish.month, self.publish.day, self.slug])
class Comment(models.Model):
    post = models.ForeignKey(Post,
                            on_delete=models.CASCADE,
                            related_name='comments')
    name = models.CharField(max_length=80)
    email = models.EmailField()
    body = models.TextField()
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    active = models.BooleanField(default=True)
    class Meta:
      ordering = ('created',)
    def __str__(self):
      return f'Comment by {self.name} on {self.post}'
      